Anker Astro E1 6700mAh review. Is this the best value portable charger?

The Anker Astro E1 has a 6700mAh capacity, which is enough for at least one complete charge of any of the latest smartphones. It won’t be enough to completely charge a tablet, but could typically provide a 50% charge at least. And unusually for a smaller portable charger, it offers a fast charging current of 2A, comparable to a wall charger.

Overview

It’s a compact but dense unit, just fitting into the palm of my hand and weighing 125g. It has a glossy black finish, which easily picks up fingerprints – personally I’d prefer a matte finish. It comes with a soft mesh pouch and an Anker branded 55cm or 21″ micro-USB cable. I’ve purchased a few Anker cables and they are good quality – this one doesn’t feel as premium and there’s no velcro strap but it’s more than adequate.

micro-USB 1A input port and USB 2A output

There are just two ports, a micro-USB input port for charging the device itself, and a standard USB output port for charging other devices. The supplied cable can be used for both charging the unit and the other way around to charge any device with a micro-USB port. Or you can just use your existing lightning cable or USB-C cable to charge an iPhone or a GoPro for instance.

Side button illuminates front LEDs to indicate remaining charge

Around the side there’s a button to display remaining charge – each lit dot representing 25% of charge – so 4 dots indicating 100% charge remaining. I prefer the digital display of the Cygnett Powerbank I reviewed a while back, but it’s good enough. For some devices I found I had to press this button to turn the unit on and start charging, but most devices started charging automatically.

Performance

Measuring maximum charging current of 1A

Charging the device is quite slow with only a 1A input – it takes approximately 6 hours for a full charge. It’s not a major issue since this is more of an emergency charger, but larger capacity devices with a 2A input for example, can charge twice as fast. The lights turn off when you get to full charge.

The quoted capacity of 6700mAh is good for a device this size and the 2A charging current is double that of a lot of comparable chargers. In fact, some tablets like iPads won’t reliably charge off less than a 2A charger.

Measuring current charging an iPhone 6 Plus

That doesn’t mean all devices will charge at the full 2A – measuring the charging current with this USB current meter, a iPhone 6 Plus charges at 1.6A, a Samsung Tablet at 1.5A and a GoPro Hero 5 Black at 1.1A. I compared these results against these devices with their original packaged wall chargers and the optional GoPro Supercharger and got similar results for the Samsung and the GoPro and only 1A with the Apple “slow” 1A wall charger unsurprisingly. Compared to the more expensive Cygnett charger, which also delivers up to 2A the results off the Anker were actually better, perhaps down to Anker’s PowerIQ technology doing a better job of identifying the device connected to it to deliver the optimal charge.

Charging the iPhone 6 Plus with the Cygnett charger. Anker’s PowerIQ technology appears to allow for optimal charging (1.2A with the Cygnett versus 1.6A with the Anker)

6700mAh is a decent capacity and enough for at least one complete charge of any of the larger smartphones currently on the market including the Plus variants of the iPhone 7 and 8 and the new iPhone X, the Samsung S8+ and the Google Pixel 2 XL; with batteries ranging in capacity from 2700mAh to 3500mAh. Smaller phones like the iPhone 8 with only a 1820mAh battery should achieve two full charges. I would want more capacity for a long journey or a trip away, but considering its cost and size, it’s a good compromise.

Conclusions

The Anker Astro E1 is good value with a decent capacity and a relatively compact size. As an emergency charger to have on you when you’re out and about it’s almost perfect. The capacity is sufficient for at least getting you through the day and the fast charging port is welcome at this price point. It could be slimmer, and charging the device is slow which could be an issue if used regularly. But if you’re after a portable charger and don’t want to spend too much money, I would recommend it.

Pros

Very reasonably priced

Good build quality

Comes with Anker branded cable and soft pouch

6700mAh capacity decent for its size

Fast charging 2A port, also suitable for tablets

Cons

Could be thinner

Slow charging of device itself – only 1A

No wall charger (although not really expected at this price)

Glossy plastic not to everyone’s taste

I hope you found this article useful. If you have any specific questions, please do ask below in the comments section – I do my best to reply to any questions.

And as ever if have found the review helpful, please consider using the Amazon links below for any purchases. It doesn’t cost you a penny, and the small amount of commission I get will keep the site going! Thank you.

Comments

This is a great post! Anker charges are usually some of the best on the market and have a strong brand name behind them. This is a really useful review, there are many desirable features here. There are so many portable charges on the market with so many different prices, it’s hard to know which one is the best value for money and is going to the most reliable; they really are a great function!

Great idea,
After purchasing a different charger that did not work and another that broke in less than 2 days for my daughters Acer 500 tablet, I ordered this charger based on previous reviews. The charger is good quality, works as advertised and after a couple of months we have had no issues with it. I would recommend this charger for anyone looking to get a replacement as good as the original OEM charger.
Thanks,
Stiveboro

Gidon’s obsession with technology began at an early age with a BBC B Micro computer. After working for 12 years at British Telecom travelling around the world as a technology researcher he opened a technology retail store in Tavistock in Devon, selling the latest tech and offering IT services to residential and business customers. Read More…

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